@RequestMapping(value="/verifyCode", method=RequestMethod.GET)
@ResponseBody
public Result<String> getMiaoshaVerifyCod(HttpServletResponse response,MiaoshaUser user,
@RequestParam("goodsId")long goodsId) {
if(user == null) {
return Result.error(CodeMsg.SESSION_ERROR);
}
try {
BufferedImage image = miaoshaService.createVerifyCode(user, goodsId);
OutputStream out = response.getOutputStream();
ImageIO.write(image, "JPEG", out);
out.flush();
out.close();
return null;
}catch(Exception e) {
e.printStackTrace();
return Result.error(CodeMsg.MIAOSHA_FAIL);
}
}
public BufferedImage createVerifyCode(MiaoshaUser user, long goodsId) {
if(user == null || goodsId <=0) {
return null;
}
int width = 80;
int height = 32;
//create the image
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// set the background color
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
// draw the border
g.setColor(Color.black);
g.drawRect(0, 0, width - 1, height - 1);
// create a random instance to generate the codes
Random rdm = new Random();
// make some confusion
for (int i = 0; i < 50; i++) {
int x = rdm.nextInt(width);
int y = rdm.nextInt(height);
g.drawOval(x, y, 0, 0);
}
// generate a random code
String verifyCode = generateVerifyCode(rdm);
g.setColor(new Color(0, 100, 0));
g.setFont(new Font("Candara", Font.BOLD, 24));
g.drawString(verifyCode, 8, 24);
g.dispose();
//把验证码存到redis中
int rnd = calc(verifyCode);
redisService.set(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, rnd);
//输出图片
return image;
}
private static int calc(String exp) {
try {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
return (Integer)engine.eval(exp);
}catch(Exception e) {
e.printStackTrace();
return 0;
}
}
private static char[] ops = new char[] {'+', '-', '*'};
/**
* + - *
* */
private String generateVerifyCode(Random rdm) {
int num1 = rdm.nextInt(10);
int num2 = rdm.nextInt(10);
int num3 = rdm.nextInt(10);
char op1 = ops[rdm.nextInt(3)];
char op2 = ops[rdm.nextInt(3)];
String exp = ""+ num1 + op1 + num2 + op2 + num3;
return exp;
}
@RequestMapping(value="/path", method=RequestMethod.GET)
@ResponseBody
public Result<String> getMiaoshaPath(HttpServletRequest request, MiaoshaUser user,
@RequestParam("goodsId")long goodsId,
@RequestParam(value="verifyCode", defaultValue="0")int verifyCode
) {
if(user == null) {
return Result.error(CodeMsg.SESSION_ERROR);
}
boolean check = miaoshaService.checkVerifyCode(user, goodsId, verifyCode);
if(!check) {
return Result.error(CodeMsg.REQUEST_ILLEGAL);
}
String path =miaoshaService.createMiaoshaPath(user, goodsId);
return Result.success(path);
}
public boolean checkVerifyCode(MiaoshaUser user, long goodsId, int verifyCode) {
if(user == null || goodsId <=0) {
return false;
}
Integer codeOld = redisService.get(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, Integer.class);
if(codeOld == null || codeOld - verifyCode != 0 ) {
return false;
}
redisService.delete(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId);
return true;
}
public String createMiaoshaPath(MiaoshaUser user, long goodsId) {
if(user == null || goodsId <=0) {
return null;
}
String str = MD5Util.md5(UUIDUtil.uuid()+"123456");
redisService.set(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, str);
return str;
}
@RequestMapping(value="/{path}/do_miaosha", method=RequestMethod.POST)
@ResponseBody
public Result<Integer> miaosha(Model model,MiaoshaUser user,
@RequestParam("goodsId")long goodsId,
@PathVariable("path") String path) {
model.addAttribute("user", user);
if(user == null) {
return Result.error(CodeMsg.SESSION_ERROR);
}
//验证path
boolean check = miaoshaService.checkPath(user, goodsId, path);
if(!check){
return Result.error(CodeMsg.REQUEST_ILLEGAL);
}
}
public boolean checkPath(MiaoshaUser user, long goodsId, String path) {
if(user == null || path == null) {
return false;
}
String pathOld = redisService.get(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, String.class);
return path.equals(pathOld);
}
